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-4(x+2y)2+9(2x-y)2
人气:424 ℃ 时间:2020-01-29 00:57:19
解答
-4(x+2y)2+9(2x-y)2
=9(2x-y)2-4(x+2y)2
=[3(2x-y)+2(x+2y)][3(2x-y)-2(x+2y)]
=(8x+y)(4x-7y).
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